This is only my opinion, but you're paying a lot for "collector value" on stuff like that. I believe plain old nothing special rounds and bars will be cheaper, as long as they say ".999 fine silver" on them somewhere. And I've always dealt with small local coin shops, never any "supershops", pawn shops, or online dealers. Low overhead means lower prices, and no shipping costs.
I'd much rather have a 1 oz bar of plain silver for a cheaper price than a 1oz showpiece silver round that cost a lot more. I would also watch the spot price and buy on price dips if possible.